Clock



FIG. 1 is a front perspective view of a clock embodying my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof, the bottom plan view being a mirror image of the top plan view as shown; and

FIG. 5 is an enlarged fragmentary view of another embodiment of my new design, the remaining portions thereof being identical to FIGS. 1-4.

The broken-line showings of a clock movement in FIGS. 2 and 3 are environmental only and form no part of the claimed design. 

The ornamental design for a clock, substantially as shown and described. 